Just in case you go for the P1's secret character (like bluebearrie is doing) here's my tips on getting him. During the child stage (marutchi) take perfect care, do not feed it snacks at all just play the game with it and catch every discipline. Once it changes into the teen stage ignore all dicsiplines, this will insure you get Maskitchi (who is needed to get the secret character). After getting Maskitchi continue taking perfect care and catch all his disciplines, normally shortly after giving him his last discipline it'll get sick and will change either before going to bed the same day or early the next morning.
Hope this helps you out and congrats on getting a P1!